diff options
author | Max Kellermann <max@duempel.org> | 2014-08-11 20:42:51 +0200 |
---|---|---|
committer | Max Kellermann <max@duempel.org> | 2014-08-11 21:48:25 +0200 |
commit | 88a2f128ec9e72bb53a8d6646ce44d7053862f78 (patch) | |
tree | 252d3712ea1d23d1d68c0bb63c781ce5a3035612 /src/fs/io/AutoGunzipReader.cxx | |
parent | 45c139cfb36fd0801faded97683aa7faa83809b1 (diff) | |
download | mpd-88a2f128ec9e72bb53a8d6646ce44d7053862f78.tar.gz mpd-88a2f128ec9e72bb53a8d6646ce44d7053862f78.tar.xz mpd-88a2f128ec9e72bb53a8d6646ce44d7053862f78.zip |
fs/io/AutoGunzipReader: new class
Diffstat (limited to 'src/fs/io/AutoGunzipReader.cxx')
-rw-r--r-- | src/fs/io/AutoGunzipReader.cxx | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/src/fs/io/AutoGunzipReader.cxx b/src/fs/io/AutoGunzipReader.cxx new file mode 100644 index 000000000..2552f7b99 --- /dev/null +++ b/src/fs/io/AutoGunzipReader.cxx @@ -0,0 +1,70 @@ +/* + * Copyright (C) 2003-2014 The Music Player Daemon Project + * http://www.musicpd.org + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include "config.h" +#include "AutoGunzipReader.hxx" +#include "GunzipReader.hxx" +#include "util/Error.hxx" + +AutoGunzipReader::~AutoGunzipReader() +{ + delete gunzip; +} + +gcc_pure +static bool +IsGzip(const uint8_t data[4]) +{ + return data[0] == 0x1f && data[1] == 0x8b && data[2] == 0x08 && + (data[3] & 0xe0) == 0; +} + +inline bool +AutoGunzipReader::Detect(Error &error) +{ + const uint8_t *data = (const uint8_t *)peek.Peek(4, error); + if (data == nullptr) { + if (error.IsDefined()) + return false; + + next = &peek; + return true; + } + + if (IsGzip(data)) { + gunzip = new GunzipReader(peek, error); + if (!gunzip->IsDefined()) + return false; + + + next = gunzip; + } else + next = &peek; + + return true; +} + +size_t +AutoGunzipReader::Read(void *data, size_t size, Error &error) +{ + if (next == nullptr && !Detect(error)) + return false; + + return next->Read(data, size, error); +} |